LT 2(Unit 2)

Question 1

Steps of Cell Development

Answer 1

1. Conception
2. Cleavage - cell differentiation
3. Blastocyst
4. Gastrulation

Question 2

Cleavage

Answer 2

rapid cell division - also when cells differentiate

Question 3

Cell Differentiation

Answer 3

• a process that enables cells to divide
• Stem cells - cells that can divide as many times as they want without specializing and can create new cells that do specialize
• Progenitor Cell - partially specialized stem cells, can occur after cell division

Question 4

Blastocyst

Answer 4

cluster of dividing cells, implanted in the uterus

Question 5

Gastrulation

Answer 5

Cells start to specialize and split into three primary germ layers

Question 6

Three primary germ layers

Answer 6

• endoderm
• ectoderm
• mesoderm

Question 7

Endoderm

Answer 7

innermost layer, forms lining of digestive tract and its derivatives

Question 8

Mesoderm

Answer 8

middle layer, forms tissue for blood vessels, muscles, bones

Question 9

Ectoderm

Answer 9

outer layer, forms the skin

Question 10

Histogenisis

Answer 10

process of germ layers differentiating into different tissues